Python 3.14 has a new feature called the template string, or t-string, type. A t-string superficially resembles an f-string, but it’s designed to do something very different.

Today, constants in Python are mostly a matter of convention. Using a name that’s in all-caps and snake case — e.g., DO_NOT_RESTART — is a hint that the variable is intended to be a constant.

Lists Like strings, lists provide sequential storage through an index offset and access to single or consecutive elements through slices. Strings consist only of characters and are immutable (cannot ...